#[non_exhaustive]pub enum StackInstanceFilterName {
DetailedStatus,
DriftStatus,
LastOperationId,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against StackInstanceFilterName
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let stackinstancefiltername = unimplemented!();
match stackinstancefiltername {
StackInstanceFilterName::DetailedStatus => { /* ... */ },
StackInstanceFilterName::DriftStatus => { /* ... */ },
StackInstanceFilterName::LastOperationId => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when stackinstancefiltername
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant StackInstanceFilterName::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
StackInstanceFilterName::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant StackInstanceFilterName::NewFeature
is defined.
Specifically, when stackinstancefiltername
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on StackInstanceFilterName::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
DetailedStatus
DriftStatus
LastOperationId
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl StackInstanceFilterName
impl StackInstanceFilterName
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for StackInstanceFilterName
impl AsRef<str> for StackInstanceFilterName
source§impl Clone for StackInstanceFilterName
impl Clone for StackInstanceFilterName
source§fn clone(&self) -> StackInstanceFilterName
fn clone(&self) -> StackInstanceFilterName
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for StackInstanceFilterName
impl Debug for StackInstanceFilterName
source§impl Display for StackInstanceFilterName
impl Display for StackInstanceFilterName
source§impl From<&str> for StackInstanceFilterName
impl From<&str> for StackInstanceFilterName
source§impl FromStr for StackInstanceFilterName
impl FromStr for StackInstanceFilterName
source§impl Hash for StackInstanceFilterName
impl Hash for StackInstanceFilterName
source§impl Ord for StackInstanceFilterName
impl Ord for StackInstanceFilterName
source§fn cmp(&self, other: &StackInstanceFilterName) -> Ordering
fn cmp(&self, other: &StackInstanceFilterName) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for StackInstanceFilterName
impl PartialEq for StackInstanceFilterName
source§fn eq(&self, other: &StackInstanceFilterName) -> bool
fn eq(&self, other: &StackInstanceFilterName) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for StackInstanceFilterName
impl PartialOrd for StackInstanceFilterName
source§fn partial_cmp(&self, other: &StackInstanceFilterName) -> Option<Ordering>
fn partial_cmp(&self, other: &StackInstanceFilterName) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for StackInstanceFilterName
impl StructuralPartialEq for StackInstanceFilterName
Auto Trait Implementations§
impl Freeze for StackInstanceFilterName
impl RefUnwindSafe for StackInstanceFilterName
impl Send for StackInstanceFilterName
impl Sync for StackInstanceFilterName
impl Unpin for StackInstanceFilterName
impl UnwindSafe for StackInstanceFilterName
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
source§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left
is true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
self
into a Left
variant of Either<Self, Self>
if into_left(&self)
returns true
.
Converts self
into a Right
variant of Either<Self, Self>
otherwise. Read more